code: def test_noop_transform():
      transformed_schema = transform_schema(
          TestSchema,
          TransformSpec(
              lambda x: x, edit_fields=None, removed_fields=None
          ),
      )
      assert set(transformed_schema.fields) == set(TestSchema.fields)
  
file_path: petastorm/petastorm/tests/test_transform.py
imports: import numpy
  import pytest
  from petastorm.transform import edit_field, transform_schema, TransformSpec
  from petastorm.unischema import Unischema, UnischemaField
label_desc: Use image node_id 1 for calling a global function with example usage: test_noop_transform() without return types